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dwc2 set txfifo empty level to complete and change back fifo tx to normal … #2585

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Apr 10, 2024
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dwc2 set txfifo empty level to complete and change back fifo tx to normal … #2585

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12 changes: 7 additions & 5 deletions src/portable/synopsys/dwc2/dcd_dwc2.c
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Original file line number Diff line number Diff line change
Expand Up @@ -154,9 +154,11 @@ static bool fifo_alloc(uint8_t rhport, uint8_t ep_addr, uint16_t packet_size) {
dwc2->grxfsiz = sz;
}
} else {
// The fifo-empty interrupt fires when the interrupt is half empty. In order
// Note if The TXFELVL is configured as half empty. In order
// to be able to write a packet at that point, the fifo must be twice the max_size.
fifo_size = fifo_size * 2;
if ((dwc2->gahbcfg & GAHBCFG_TXFELVL) == 0) {
fifo_size *= 2;
}

// Check if free space is available
TU_ASSERT(_allocated_fifo_words_tx + fifo_size + dwc2->grxfsiz <= _dwc2_controller[rhport].ep_fifo_size / 4);
Expand Down Expand Up @@ -596,13 +598,13 @@ void dcd_init(uint8_t rhport) {
int_mask = dwc2->gotgint;
dwc2->gotgint |= int_mask;

// Configure TX FIFO to set the TX FIFO empty interrupt when half-empty
dwc2->gahbcfg &= ~GAHBCFG_TXFELVL;

// Required as part of core initialization.
dwc2->gintmsk = GINTMSK_OTGINT | GINTMSK_RXFLVLM |
GINTMSK_USBSUSPM | GINTMSK_USBRST | GINTMSK_ENUMDNEM | GINTMSK_WUIM;

// Configure TX FIFO empty level for interrupt. Default is complete empty
dwc2->gahbcfg |= GAHBCFG_TXFELVL;

// Enable global interrupt
dwc2->gahbcfg |= GAHBCFG_GINT;

Expand Down
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